Have You Seeing Double? 13
this contrasts with inline deduplication, which would process all data as it’s written and may impact performance of certain types of data. Although inline deduplication processes all data immediately, it doesn’t always make it a poor choice for implementation on primary storage. It just means that storage tiering—determining where you need the best performance—is a crucial first step before deciding to apply deduplication technology to primary storage.
Does Your Data
Fit the Bill? Data that requires frequent
access with optimum write performance won’t be a good fit for data deduplication. Data that’s difficult to deduplicate due to its format can be stored on a no-deduplication, lower performance disk array to keep costs down. The remaining unstructured data that doesn’t require frequent or high-performance access (such as application or user file data) can be stored on a deduplication-enabled primary storage array.
Data Selection Checklist
Regardless of the deduplication technology implemented, data selection is the most important step in developing a deduplication strategy for primary storage. Here’s a checklist that summarizes your selection criteria:
• Choose primarily unstructured data; data that is subject to performance requirements and frequent write access should be avoided.
• Avoid encrypted or imaging-type data.
• Virtual machine files in a virtualized environment contain a lot of duplicates, so these are a good fit.
• Files that haven’t been accessed for a predetermined number of days are a good fit.
• Medium-term retention data or non-transient data.
A good combination of data selection and storage tiers will enable data deduplication on primary storage to increase utilization efficiency without negatively impacting I/O.
About the Author: Pierre Dorion specializes in the areas of business continuity and disaster recovery planning services and corporate data protection. Over the past 10 years, he has focused primarily on the development of recovery strategies, IT resilience and recoverability, as well as data protection and availability engagements at the data center level.
©ANDRES RODRIGUEZ, ©3D BRAINED, ©ISTOCK PHOTO
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